The European Commission and the FTC have both made major pronouncements about AI enforcement, highlighting the need to prevent troubling outcomes from algorithm use. The auditing of AI algorithms is a developing practice addressing this need, with Twitter earlier this year buying one of the few specialist firms. This final article in a three-part series examines two recently completed audits of widely used AI services and presents insights from algorithm auditors and AI incident responders about the practical role of AI audits. Part one covered compliance essentials for AI/ML tools, while part two supplied questions to guide AI oversight. See “How to Achieve Trustworthy AI Using the European Commission’s Final Assessment List” (Aug. 5, 2020).